Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea82ea353348b68b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb6ca6587a3156b32d3c67e870db00d0 SHA-1: 7249f6059e1d06061f73238b645a341198ebf7bf SHA-256: ea82ea353348b68b2d4cd57ccb8a729cc10f63034a3adfebfdff98739ce456f6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including malformed streams and a high ML classification score. It functions as a link farm, directing users to various compromised websites and disposable domains, likely to facilitate the download of a secondary payload. The presence of numerous embedded URLs and the ClamAV detection strongly suggest a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=telugu+new+hd+movies+downloading PDF link annotation
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/37122200942.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc020839b---wisezafobawabinomu.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/fusurixavikobagopukapib.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/wodokisudoxepigudeb.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/1656132280.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/89380046012.pdfIn PDF document text
    • http://c-six.it/userfiles/files/32679728780.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614032c1066c2---33738092881.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jerepusoxofesorepaterodax.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/modufedo.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81094493703.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/jinegeluv.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/biluguvemokerupu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xelamigisezovodivavura.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/5925782498.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210905065303.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/moxesedafotubuwejadewupi.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/pebetez.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/moxutuxidefubipodibipode.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0467b685---luxibelim.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/99486761343.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/minukufenidutuparo.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/xaxojat.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/89374933586.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 17692 bytes
SHA-256: 371092eec941c335eb1fd03cab69305135749a28a0f64376358adca26253954a
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10712 bytes
SHA-256: 49774addcc0d114afcc5926ab14109dce772211263ab74492b1f782defae92a6
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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